White Sparkles on SDI output

I have a AJA LHE inside a MacPro with the latest OS and with 5.1.4 When we output via SDI we occasionally get white sparkles on output and this results in a failed QC. Does anyone have any suggestions as to how to remove this and what this is?

Normally we just restart and it will go away, but it will come back with no rhyme or reason. Any feedback would be great.

Do you see the white sparkles in the FCP output or are they just on the Digibeta? Are you monitoring the Kona output separately from the Digibeta recording? The reason I ask is that it's possible the heads on the Dbeta are going bad.